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3 years ago

Evaluate the expression 8-5xy^3 for x=3 and y = -2

Mathematics

2 answers:

Elanso [62]3 years ago

6 0

Answer:

128

Step-by-step explanation:

8 - 5 x 3 x -2^3

8 - 5 x 3 x -8

8 - 15 x -8

8 - -120

128

Damm [24]3 years ago

6 0

Given info:-

Evaluate the expression 8-5xy^3 for x=3 and y = -2.

8 - 5xy^3

⇛8 - 5(3)(-2)^3

⇛8 - 15(-2*-2*-2)

⇛8 - 15(-8)

⇛8 - (-120)

⇛8 + 120

⇛128 Ans.

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3 years ago

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yan [13]

Answer:

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Step-by-step explanation:

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$N=N_o\times 0.1861$

Formula used for number of half lives

$N=\frac{N_o}{2^n}$

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N= amount of reactant left after n-half lives

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$N_o\times 0.1861=\frac{N_o}{2^n}$

$2^n=\frac{1}{0.1861}$

$2^n=5.3734$

Taking log both sides

$n\log 2=\log (5.3734)$

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3 years ago